Reviewed By Tim M (Calera, AL) Reviewed for a 2012 Nissan Frontier —9/26/2007 3:04 AM
i've had it for a month and so far it seems to be helping my mileage. i drive 100 miles a day round trip to work and i've been getting about a mile per gallon better in my gmc canyon. i read all the reviews saying it didn't help newer vehicles. i was very reluctant to buy, but with gas prices so high i had to try it. the only bad thing i've noticed is a little rough idle sometimes.